diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 39f57ad..80bc818 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -45,6 +45,10 @@
 static void check_tbf(gprs_rlcmac_tbf *tbf)
 {
 	OSMO_ASSERT(tbf);
+	if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE))
+		OSMO_ASSERT(tbf->T == 3191 || tbf->T == 3193);
+	if (tbf->state_is(GPRS_RLCMAC_RELEASING))
+		OSMO_ASSERT(tbf->T != 0);
 }
 
 /*